lkml.org 
[lkml]   [2004]   [Oct]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] document mmiowb and readX_relaxed a bit more in deviceiobook.tmpl
From
Date
On Fri, 2004-10-29 at 17:47 -0700, Jesse Barnes wrote:
> This is a small patch to deviceiobook.tmpl to describe the new mmiowb routine
> a bit more completely. I've also updated it to provide pointers to drivers
> that do write flushing, use mmiowb, and use the readX_relaxed routines.

It's all good, but your semantics and description are very tailored to
your specific arch problem vs. unlock.

What about my suggestion of defining a broader semantic of mmiowb() as
beeing a barrier ordering MMIOs vs. the rest of the world ? The later
includes stores to memory _and_ spinlock/unlock.

I still intend to eventually make good use of that on ppc64 to get rid
of the expensive barriers we had to put in our writeX() implementations,
though I didn't have time to work on that yet.

Ben.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:07    [W:0.045 / U:0.012 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site